worn once girls 3.2 LS full wetsuit - never worn, tags on. Roxy Infinity Our girl skipped right past size 6 and into an 8 this summer. she had it on for 30 seconds and said "too tight!!" I don't think 60-70lbs is at all accurate for sizing. I'd say 40 to 60 :) she's LOVED the same suit in her own size - relatively easy on/off with the zip back